Many dash cams have a “parking mode” feature that allows them to continue recording even when the car is turned off. This is typically accomplished by using a motion detector or a G-sensor that can detect when the car is hit or moved while parked. Some dash cameras also have a built-in battery or capacitor that can power the camera for a short period of time while the car is turned off.
Using a dash cam to monitor your car while parked can be helpful in case of hit-and-runs or vandalism, and can provide valuable evidence to the police or your insurance company.